Fuel-injecting nozzle



l Patented Sept. 13, 1927.

AUNITEDl STATES PATENT f oFFicE.

CARL FRITZ SJ'MAN AND CARL GUSTAF PETTERSSON, OF STOCKHOLM, SWEDEN, AS-

SIGNORS TO J. & C. Gr. BOLINDERS MEKANISKAV'VERKSTADS AKTIEBOLAG, Ol'

STOCKHOLM, SWEDEN.

AFUEL-INJno'rINe NozzLE.

Application led July 13, 19,23, Serial No. 651,360, and in Sweden March 1, 1922.

This invention relates to such fuel 'inject' ing nozzles, in which a movement is impartedl to the fuel before the injection, said movement performing spraying of the fuel jet when leaving the outlet openingr of the nozzle. The object of the invention is to facilitate adjustment of the magnitude of the spraying.

This is obtained according to the invention 1Q by dividing the fuel before the injection in i different currents or groups of currents. which perform each a spraying of the fuel, but are brought mutually by adjustment to counter-act eac-h other as to their spraying action.` By this it will be possible to adjust y with great accuracy the angle of spread of the jet. If, for instance, the one current or group 'of currents is caused to lact undisturbed by the othenthe widest angle of zo spread of the jet is obtained. However, as soon as on the other hand the counter-acting current or group of currents is brought into action, the angle 'of spread ofthe jet will decrease on account of the counter-action. and if the currents or groups ofv currents counter-acting each other be equal as to the strength, the movement performing the spraying will cease andl the fuel will be 1njected without spraying, i; e; asa straight 'et. i l "The adjustment maybe performed by varying the strength of but one of the .cur-v rents or groupsof currents or of both. The former case, in which the one current or 4group of currents remains constant,l has proved to be the most suitable and simple for the object in view.

An embodiment of the device suitable from constructional point of view consists in providing the nozzle with two fuel conduits leading both to a cavity located inside the outlet of the nozzle and into which the conduits open tangentially or in such other Way obliquely that the fuel will be brought to rotate within the cavity. The channels from the one conduit are directed towards the channels from the other conduit so that the fuel currents from both conduits will counter-act each other. By means of a throttling device in the one conduit the strength of the current from said conduit may be adjusted, i. e. the counter-action of the current may be made more or less strong so that the sprayingof the fuel will be varied accordingly. `f

The annexed drawingr shows t-he invention carried out in the manner i set forth above. Fig. .1 is a longitudinal section of the nozzle. Fig. 2 is a similar view on-an enlarged scale of the portion of the nozzle situated next to the outlet opening. Fig. 3

shows the nozzle viewed from the outlet end with the outer part in section. Y

Disposed immediately inside the injection opening 1 of thenozzle is a cavity 2, into which the fuel currents or groups vof fuel currents counter-acting each other are conducted. The separate conduits for the said current-s are arranged in the following manper. A sleeve 3, in the bottom of which the injection opening 1 is provided, encloses a sleeve 4 into which projects an adjustable spindle 5 provided vwith a valve member 6, bearing against a seat in the sleeve 4. The said sleeve is of greater diameter than the spindle so that achamber 7 will be formed between said parts. said chamber communieating through openings 8 in the wall of the sleeve 4 with a chamber 9 located between the spindle and an outer surrounding sleeve or body 10. The sleeves 3, 4 and 10 conjointly form ay body means for the delivery of the spray. When the valve 6 is according tothe drawing pressed onto its seat, the chamber 7 between kthe spindle 5 and the sleeve 4 is closed from a chamber 11 l0- cated in the sleeve. channels 12 leading from the-'said chamber 11 tov channels v13 on'the outside of the sleeve 4 and said latter channels communicating with channels 14 disposed on the conical end surface of the sleeve 4 and opening into the cavity 2 in a direction obliouely to the radius.

Thus.y the chamber 9. the openings 8, the chamber 7, the chamber 11 and the chamnels 12, 13 and 14` respectively, form the conduit for one of the two counter-acting fuel currents and said 'conduit may be closed or opened to the` desired degree by turning the valve spindle 5.

The conduit for the other fuel current consists of longitudinal channels 15 formed on the outside of the sleeve 4 and communicating at their outer ends with channels 16 formed in the conical end surface of the sleeve 4. The last mentioned channels,

I the direction of the arrow a, Fig. 3,' due to.

which open also into the cavity 2, are, as apparent from Fig. 3, directed obliquely to the radius, vso as to bring the fuel to rotate within the cavity. Besides, they are, however, directed towards the oblique channels 141, .sovthat the fuel currents; througliesaidV lattenchannels will be counter-acted by the currents through the channels 16. The inner ends of the channels 15 communicate with a chamber 18 situated between the sleeves 3 and 4l and communicating.witl't the chamber 9, which communicates in ordinary manner vwith the inlet 17 through whichthe fuel is supplied under pressure.

The device acts in the following/manner: When-'the Valve 6 isl closed, as shownin the drawing, the fuel passes from the inlety 17 and the chamber 9 through the chamber 18 and the channels 15 and 16l-to the vcavity- 2, in which the fuel is caused to rot-ate in.

the oblique posit-ion of the channels 16'. On. account of the said rotation the jet forced through the opening 1 is sprayed as soon as it leaves the -said opening.

spraying is to be decreased, the valvespindle 5 is turned so that theV Valve will open.

Hereby, the counter-acting fuel'conduit is opened and the fuel passes through the openings 8, the chamber 7', the-chamber 11 andthe channels 12, 13 and'lllf-tor the cavi-ty 2... On account of the 'channels 14 being directed obl-iquely and towards the channels 16, the fuel current through the channels In this case the spraying is the greatest possible. lf the sai-d chamber for producing whirling mofY tions of the streams ofliquid entering-said chamber, the whirling motions ofY there-- spective streams being opposed to onean-i other and arrested by mutual counteraction prior to the discharge of the liquid fromthe` body means, means for controlling-the-passsage of liquid through certainofthe: passagesfor-varying thecounteraction ofifthef whirling motion of one streamto the-.other` whereby to vary the angle of spread ofthe jet issuing from the disch-arge opening.

2; A nozzle comprising'. a body, inner and outer 'hollow members arranged one within the other and carried by one end-ofthebody. the outer member having a discharge? opening therein andsaid members being arranged in spaced relation to provide ai chamber in communication-with the discharge opening, groups of oppositely inclined oblique channels between the members, opening into vsaid chamber, .means for conductingiliquidfrom the interior ofvsaid body between said vmembers to certain -of the inclined channels', means for conducting liquid from Vthe interior of tlie inner member to the olppositely inclined channels,A afvalve controlling the admission'of liquifdfto the interior of the inner member.

In testimonyvwhereof we aftxour signatures.` v

CARL rnrrz sniinin. CARL ener. riarrnnsson. 

